Functions:
A function is a fundamental concept in mathematics, often described as a "black box" that processes an input to produce a corresponding output. You don't necessarily need to understand the internal workings of a function to use it—simply provide an input, and the function will return the appropriate output.Example:
f(x) = y
In this example, x is the input (independent variable), and y is the output (dependent variable) produced by the function f.
Consider the function:
f(x) = 2x + 5
To evaluate the function for x = 5:
f(5) = 2 × 5 + 5
= 10 + 5
= 15
Therefore, f(5) = 15.